Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8205692 | Rock bit and inserts with a chisel crest having a broadened region | Scott D. McDonough, Brandon M. Moss | 2012-06-26 |
| 7832506 | Cutting elements with increased toughness and thermal fatigue resistance for drilling applications | Dah-Ben Liang, Gary R. Portwood, Amardeep Singh, Jonathan Bitler | 2010-11-16 |
| 6782959 | Cutter element with non-linear, expanded crest | Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran +1 more | 2004-08-31 |
| 6651758 | Rolling cone bit with elements fanned along the gage curve | Ying Xiang | 2003-11-25 |
| 6561293 | Cutter element with non-linear, expanded crest | Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran +1 more | 2003-05-13 |
| 6510909 | Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty | Gary R. Portwood, Gary E. Garcia, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 2003-01-28 |
| 6390210 | Rolling cone bit with gage and off-gage cutter elements positioned to separate sidewall and bottom hole cutting duty | Gary R. Portwood, Gary E. Garcia, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 2002-05-21 |
| 6161634 | Cutter element with non-rectilinear crest | Chris E. Cawthorne, Stephen C. Steinke, Gary R. Portwood, Gary E. Garcia, David P. Moran | 2000-12-19 |
| 6059054 | Non-symmetrical stress-resistant rotary drill bit cutter element | Gary R. Portwood, Gary E. Garcia, Per Ivar Nese, Chris E. Cawthorne, Scott D. McDonough | 2000-05-09 |
| 6029759 | Hardfacing on steel tooth cutter element | Jiinjen Albert Sue, Zhigang Fang | 2000-02-29 |
| 5967245 | Rolling cone bit having gage and nestled gage cutter elements having enhancements in materials and geometry to optimize borehole corner cutting duty | Gary E. Garcia, Gary R. Portwood, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne +1 more | 1999-10-19 |
| 5868213 | Steel tooth cutter element with gage facing knee | Dennis Cisneros, Scott D. McDonough, Chris E. Cawthorne | 1999-02-09 |
| 5839526 | Rolling cone steel tooth bit with enhancements in cutter shape and placement | Dennis Cisneros, Scott D. McDonough, Chris E. Cawthorne | 1998-11-24 |
| 5833020 | Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty | Gary R. Portwood, Gary E. Garcia, Per Ivar Nese, Dennis Cisneros, Chris E. Cawthorne | 1998-11-10 |
| 5421424 | Bowed out chisel insert for rock bits | Gary R. Portwood, Scott D. McDonough, Michael A. Siracki | 1995-06-06 |
| 5172777 | Inclined chisel inserts for rock bits | Michael A. Siracki | 1992-12-22 |
| 5172779 | Radial crest insert | Michael A. Siracki, Gary R. Portwood, Chris E. Cawthorne | 1992-12-22 |
| 4832139 | Inclined chisel inserts for rock bits | Chris E. Cawthorne | 1989-05-23 |